That's because it's not different. The O2 sensor has nothing to do with the EGR.
JDM heads do not have the EGR cooler installed. There is a block-off plate on the passenger (US) rear of the head...the intake manifold has an EGR block-off plate in the usual place. Otherwise, the heads...
You right about that...way too many of the Honda crowd type is turning an excellent car into an abomination :gotrice:
By "doing what you can"...it's sad.
A flush with alcohol would have been better prior to putting in new fluid. Now that you've done it, not a huge requirement. Brake fluid is hygroscopic (like alcohol)...the new fluid you have in there now will absorb any moisture that is left in the system. Another flush with clean fluid will...
Nice...now for the valve job ;)
There's a product called Cratex Rubberized Abrasives that is very useful for smoothing out your work. Here's a link:
http://www.nolansupply.com/superabrasives.asp?supercategory=Rubberized+and+MX+Abrasives
A lot of the sensor connectors to the main harness are different. Your '88 may not have a BVSV on the thermostat housing.
Exhaust manifolds are different...reinforcement ridges were added on top of the runners on '89+ motors.
There are several head casting differences as the years...
Reduced flow...not "plugging it up" per say. A normal CAT does the same thing, but also has the substrate inside that will impede flow as well. The CAT (even a gutted one) will also help muffle exhaust noise and reduce the "drone" sound a lot of guys experience.
Just to be clear - you will lose very little (if any) power from a hole in the DP that far down from the O2 sensor.
A gutted CAT is illegal - The power gain is minor compared to the fine if caught. Get a high flow CAT.
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